diff --git a/graphics/fv/Makefile b/graphics/fv/Makefile
index 164e6bb68bd7..8bee9692d85c 100644
--- a/graphics/fv/Makefile
+++ b/graphics/fv/Makefile
@@ -1,44 +1,53 @@
 PORTNAME=	fv
 PORTVERSION=	1.03
 PORTREVISION=	7
 CATEGORIES=	graphics
 MASTER_SITES=	http://www.eaflux.com/fv/sources/
 DISTNAME=	${PORTNAME}-src-${PORTVERSION}
 
 MAINTAINER=	ports@FreeBSD.org
 COMMENT=	Viewer of hdr/pfm images
 WWW=		http://www.eaflux.com/fv/
 
 LICENSE=	GPLv2+
 
 LIB_DEPENDS=	libpng.so:graphics/png
 
 USES=		gl gmake pkgconfig zip
 USE_GL=		glut
 ALL_TARGET=	${PORTNAME}
 
 CXXFLAGS+=	$$(pkg-config --cflags libpng) -I${LOCALBASE}/include
 LDFLAGS+=	$$(pkg-config --libs libpng) -L${LOCALBASE}/lib -lglut \
 		-lGLU -lGL -lbz2 -lm -lz -llzma -lpthread
 
 PORTDOCS=	AUTHORS ChangeLog README
 PLIST_FILES=	bin/${PORTNAME}
 
 OPTIONS_DEFINE=	DEBUG DOCS
 
 DEBUG_CXXFLAGS_OFF=	-DNDEBUG
 
+.include <bsd.port.options.mk>
+
+.if ${OPSYS} == FreeBSD && ( ${OSVERSION} >= 1400091 || ( ${OSVERSION} >= 1302505 && ${OSVERSION} < 1400000 ))
+USES+=	llvm:max=15
+CC=	clang${LLVM_VERSION}
+CPP=	clang-cpp${LLVM_VERSION}
+CXX=	clang++${LLVM_VERSION}
+.endif
+
 post-patch:
 	@${REINPLACE_CMD} -e \
 		's|^CXX=|CXX?=| ; \
 		 s|^CXXFLAGS=|CXXFLAGS?=| ; \
 		 s|^LDFLAGS=|LDFLAGS?=|' ${WRKSRC}/Makefile
 
 do-install:
 	${INSTALL_PROGRAM} ${WRKSRC}/${PORTNAME} ${STAGEDIR}${PREFIX}/bin
 
 do-install-DOCS-on:
 	@${MKDIR} ${STAGEDIR}${DOCSDIR}
 	${INSTALL_DATA} ${PORTDOCS:S|^|${WRKSRC}/|} ${STAGEDIR}${DOCSDIR}
 
 .include <bsd.port.mk>